Struts2的异常处理实战

左手的ㄟ右手 2021-07-25 02:58 390阅读 0赞

**一 action**

package org.crazyit.app.action;
    
    import com.opensymphony.xwork2.ActionSupport;
    
    import org.crazyit.app.exception.*;
    
    public class LoginAction extends ActionSupport
    {
        // 封装请求参数的username和password成员变量
        private String username;
        private String password;
    
        // username的setter和getter方法
        public void setUsername(String username)
        {
            this.username = username;
        }
        public String getUsername()
        {
            return this.username;
        }
    
        // password的setter和getter方法
        public void setPassword(String password)
        {
            this.password = password;
        }
        public String getPassword()
        {
            return this.password;
        }
    
        public String execute() throws Exception
        {
            if (getUsername().equalsIgnoreCase("user"))
            {
                throw new MyException("自定义异常");
            }
            if (getUsername().equalsIgnoreCase("sql"))
            {
                throw new java.sql.SQLException("用户名不能为SQL");
            }
            if (getUsername().equals("crazyit.org")
                && getPassword().equals("leegang") )
            {
                addActionMessage("哈哈，服务器提示！");
                return SUCCESS;
            }
            return ERROR;
        }
    }

**二 自定义异常处理类**

package org.crazyit.app.exception;
    
    public class MyException extends Exception
    {
        public MyException()
        {
        }
        public MyException(String msg)
        {
            super(msg);
        }
    }

**三 配置文件**

<?xml version="1.0" encoding="GBK"?>
    <!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">
    <struts>
        <package name="lee" extends="struts-default">
            
            <global-results>
                
                <result name="sql">/WEB-INF/content/exception.jsp</result>
                <result name="root">/WEB-INF/content/exception.jsp</result>
            </global-results>
    
            
            <global-exception-mappings>
                
                <exception-mapping exception="java.sql.SQLException" result="sql"/>
                
                <exception-mapping exception="java.lang.Exception" result="root"/>
            </global-exception-mappings>
    
            <action name="login" class="org.crazyit.app.action.LoginAction">
                
                <exception-mapping exception="org.crazyit.app.exception.MyException"
                    result="my"/>
                
                <result name="my">/WEB-INF/content/exception.jsp</result>
                <result name="error">/WEB-INF/content/error.jsp</result>
                <result>/WEB-INF/content/welcome.jsp</result>
            </action>
            <action name="*">
                <result>/WEB-INF/content/{1}.jsp</result>
            </action>
        </package>
    </struts>

**四 视图**

1 loginForm.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>登录页面</title>
    </head>
    <body>
    <form action="login.action" method="post">
    <table align="center">
        <caption><h3>用户登录</h3></caption>
        <tr>
            <td>用户名：<input type="text" name="username"/></td>
        </tr>
        <tr>
            <td>密  码：<input type="text" name="password"/></td>
        </tr>
        <tr align="center">
            <td><input type="submit" value="登录"/><input type="reset" value="重填" /></td>
        </tr>
    </table>
    </form>
    </body>
    </html>

2 welcome.jsp

3 exception.jsp

4 error.jsp

**五 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/cc05e75087c74b9cb1ff72207ce8c48b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/0a86580e714b47b0b033bc1e13a758bc.png